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The effect of Mas7 on chlorophyll a fluorescence yield and O2 level in the light. Two milliliters of 5 mm Mes and 1 mm CaSO4, pH 6.0, contained 3 × 106 cells. Far-red light (FR), actinic light (AL), 22 μm MP, and O2 were added (↑) or removed (↓) as indicated. The inset represents relative fluorescence immediately before and after Mas7 addition. This figure is a representative of 20 runs.
